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Date: Wed, 06 Jan 2016 09:49:13 +0800
From: kernel test robot <ying.huang@...ux.intel.com>
TO: Aditya Kali <adityakali@...gle.com>
CC: Serge Hallyn <serge.hallyn@...ntu.com>
Subject: [lkp] [cgroup] 1552ecad0c: INFO: suspicious RCU usage. ]
FYI, we noticed the below changes on
https://git.kernel.org/pub/scm/linux/kernel/git/sergeh/linux-security 2016-01-04/cgroupns.lockfix.rb
commit 1552ecad0cce46249034ac21a5f4de1a7e438d18 ("cgroup: introduce cgroup namespaces")
+-----------------------------------------------------------------------------+------------+------------+
| | f2a74e2f95 | 1552ecad0c |
+-----------------------------------------------------------------------------+------------+------------+
| boot_successes | 10 | 4 |
| boot_failures | 0 | 4 |
| INFO:suspicious_RCU_usage | 0 | 4 |
| BUG:sleeping_function_called_from_invalid_context_at_kernel/locking/mutex.c | 0 | 4 |
| INFO:lockdep_is_turned_off | 0 | 4 |
| WARNING:at_kernel/softirq.c:#__local_bh_enable_ip() | 0 | 4 |
| backtrace:vfs_read | 0 | 4 |
| backtrace:SyS_read | 0 | 4 |
+-----------------------------------------------------------------------------+------------+------------+
[ 55.044030] mount.nfs (3519) used greatest stack depth: 11584 bytes left
[ 56.148911]
[ 56.149300] ===============================
[ 56.150062] [ INFO: suspicious RCU usage. ]
[ 56.151432] 4.4.0-rc1-00024-g1552eca #1 Not tainted
[ 56.152911] -------------------------------
[ 56.154282] include/linux/rcupdate.h:560 Illegal context switch in RCU read-side critical section!
[ 56.157290]
[ 56.157290] other info that might help us debug this:
[ 56.157290]
[ 56.160443]
[ 56.160443] rcu_scheduler_active = 1, debug_locks = 0
[ 56.162772] 3 locks held by cat/3847:
[ 56.164038] #0: (&p->lock){+.+.+.}, at: [<ffffffff811f0a20>] seq_read+0x3c/0x350
[ 56.167012] #1: (sched_debug_lock){......}, at: [<ffffffff810d396f>] print_cpu+0x585/0x9c6
[ 56.170123] #2: (rcu_read_lock){......}, at: [<ffffffff810cbdc6>] print_cfs_stats+0x5/0x143
[ 56.173245]
[ 56.173245] stack backtrace:
[ 56.175284] CPU: 0 PID: 3847 Comm: cat Not tainted 4.4.0-rc1-00024-g1552eca #1
[ 56.177729] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Debian-1.8.2-1 04/01/2014
[ 56.180438] 0000000000000000 ffff88003c19fb70 ffffffff81505768 ffff88003c2a5100
[ 56.183292] ffff88003c19fba0 ffffffff810d85d6 ffffffff82079d0f 0000000000000269
[ 56.186135] 0000000000000000 00000000001d6300 ffff88003c19fbc8 ffffffff810b83de
[ 56.188969] Call Trace:
[ 56.190068] [<ffffffff81505768>] dump_stack+0x4b/0x63
[ 56.191581] [<ffffffff810d85d6>] lockdep_rcu_suspicious+0xf7/0x100
[ 56.193276] [<ffffffff810b83de>] ___might_sleep+0x58/0x200
[ 56.194854] [<ffffffff810b85fb>] __might_sleep+0x75/0x7c
[ 56.196416] [<ffffffff81c250d1>] mutex_lock_nested+0x3e/0x35f
[ 56.198040] [<ffffffff8105080a>] ? sched_clock+0x9/0xd
[ 56.199570] [<ffffffff810c2a54>] ? local_clock+0x20/0x22
[ 56.201124] [<ffffffff81124658>] cgroup_path_ns+0x2c/0x72
[ 56.202685] [<ffffffff81124658>] ? cgroup_path_ns+0x2c/0x72
[ 56.204375] [<ffffffff810d33e1>] task_group_path+0x4a/0x53
[ 56.205949] [<ffffffff810d3e24>] print_cfs_rq+0x52/0xb79
[ 56.207507] [<ffffffff810cbe8c>] print_cfs_stats+0xcb/0x143
[ 56.209101] [<ffffffff810d397e>] print_cpu+0x594/0x9c6
[ 56.210624] [<ffffffff810d3dc7>] sched_debug_show+0x17/0x22
[ 56.212229] [<ffffffff811f0c4e>] seq_read+0x26a/0x350
[ 56.213731] [<ffffffff81225e6f>] proc_reg_read+0x48/0x67
[ 56.215280] [<ffffffff81225e27>] ? proc_reg_write+0x67/0x67
[ 56.216866] [<ffffffff811cf299>] __vfs_read+0x26/0xb9
[ 56.218375] [<ffffffff810d5e5b>] ? up_read+0x1f/0x35
[ 56.219861] [<ffffffff8108492d>] ? __do_page_fault+0x3aa/0x424
[ 56.221508] [<ffffffff811cf969>] vfs_read+0xa0/0x12e
[ 56.222999] [<ffffffff811d04cc>] SyS_read+0x51/0x92
[ 56.224479] [<ffffffff81c295f2>] entry_SYSCALL_64_fastpath+0x12/0x76
[ 56.226192] BUG: sleeping function called from invalid context at kernel/locking/mutex.c:617
[ 56.229101] in_atomic(): 1, irqs_disabled(): 1, pid: 3847, name: cat
[ 56.230798] INFO: lockdep is turned off.
[ 56.232285] irq event stamp: 1812
[ 56.233502] hardirqs last enabled at (1811): [<ffffffff810d2e71>] sched_debug_header+0x63/0x4a5
[ 56.236352] hardirqs last disabled at (1812): [<ffffffff81c28aa7>] _raw_spin_lock_irqsave+0x27/0x88
[ 56.239178] softirqs last enabled at (1346): [<ffffffff8109828a>] __do_softirq+0x2ce/0x3bc
[ 56.241888] softirqs last disabled at (1221): [<ffffffff810985a0>] irq_exit+0x47/0x9b
[ 56.244521] CPU: 0 PID: 3847 Comm: cat Not tainted 4.4.0-rc1-00024-g1552eca #1
[ 56.246950] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Debian-1.8.2-1 04/01/2014
[ 56.249649] 0000000000000000 ffff88003c19fba0 ffffffff81505768 ffff88003c2a5100
[ 56.252582] ffff88003c19fbc8 ffffffff810b857f ffffffff82079d0f 0000000000000269
[ 56.255437] 0000000000000000 ffff88003c19fbf0 ffffffff810b85fb ffffffff8227c4a0
[ 56.258293] Call Trace:
[ 56.259372] [<ffffffff81505768>] dump_stack+0x4b/0x63
[ 56.260877] [<ffffffff810b857f>] ___might_sleep+0x1f9/0x200
[ 56.262476] [<ffffffff810b85fb>] __might_sleep+0x75/0x7c
[ 56.264076] [<ffffffff81c250d1>] mutex_lock_nested+0x3e/0x35f
[ 56.265722] [<ffffffff8105080a>] ? sched_clock+0x9/0xd
[ 56.267254] [<ffffffff810c2a54>] ? local_clock+0x20/0x22
[ 56.268802] [<ffffffff81124658>] cgroup_path_ns+0x2c/0x72
[ 56.270372] [<ffffffff81124658>] ? cgroup_path_ns+0x2c/0x72
[ 56.271955] [<ffffffff810d33e1>] task_group_path+0x4a/0x53
[ 56.273537] [<ffffffff810d3e24>] print_cfs_rq+0x52/0xb79
[ 56.275089] [<ffffffff810cbe8c>] print_cfs_stats+0xcb/0x143
[ 56.276684] [<ffffffff810d397e>] print_cpu+0x594/0x9c6
[ 56.278208] [<ffffffff810d3dc7>] sched_debug_show+0x17/0x22
[ 56.279802] [<ffffffff811f0c4e>] seq_read+0x26a/0x350
[ 56.281313] [<ffffffff81225e6f>] proc_reg_read+0x48/0x67
[ 56.282855] [<ffffffff81225e27>] ? proc_reg_write+0x67/0x67
[ 56.284445] [<ffffffff811cf299>] __vfs_read+0x26/0xb9
[ 56.285947] [<ffffffff810d5e5b>] ? up_read+0x1f/0x35
[ 56.287443] [<ffffffff8108492d>] ? __do_page_fault+0x3aa/0x424
[ 56.289067] [<ffffffff811cf969>] vfs_read+0xa0/0x12e
[ 56.290557] [<ffffffff811d04cc>] SyS_read+0x51/0x92
[ 56.292043] [<ffffffff81c295f2>] entry_SYSCALL_64_fastpath+0x12/0x76
[ 56.293761] ------------[ cut here ]------------
[ 56.295180] WARNING: CPU: 0 PID: 3847 at kernel/softirq.c:150 __local_bh_enable_ip+0x45/0xb4()
[ 56.298176] Modules linked in: snd_pcsp
[ 56.299668] CPU: 0 PID: 3847 Comm: cat Not tainted 4.4.0-rc1-00024-g1552eca #1
[ 56.302095] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Debian-1.8.2-1 04/01/2014
[ 56.304768] 0000000000000000 ffff88003c19fbe8 ffffffff81505768 0000000000000000
[ 56.307588] ffff88003c19fc20 ffffffff810939e9 ffffffff81098485 0000000000000201
[ 56.310408] ffffffff81124687 0000000000000000 00000000001d6300 ffff88003c19fc30
[ 56.313226] Call Trace:
[ 56.314296] [<ffffffff81505768>] dump_stack+0x4b/0x63
[ 56.315786] [<ffffffff810939e9>] warn_slowpath_common+0x99/0xb2
[ 56.317427] [<ffffffff81098485>] ? __local_bh_enable_ip+0x45/0xb4
[ 56.319091] [<ffffffff81124687>] ? cgroup_path_ns+0x5b/0x72
[ 56.320762] [<ffffffff81093ab5>] warn_slowpath_null+0x1a/0x1c
[ 56.322371] [<ffffffff81098485>] __local_bh_enable_ip+0x45/0xb4
[ 56.323996] [<ffffffff81c28c72>] _raw_spin_unlock_bh+0x35/0x38
[ 56.325611] [<ffffffff81124687>] cgroup_path_ns+0x5b/0x72
[ 56.327159] [<ffffffff810d33e1>] task_group_path+0x4a/0x53
[ 56.328712] [<ffffffff810d3e24>] print_cfs_rq+0x52/0xb79
[ 56.330251] [<ffffffff810cbe8c>] print_cfs_stats+0xcb/0x143
[ 56.331822] [<ffffffff810d397e>] print_cpu+0x594/0x9c6
[ 56.333328] [<ffffffff810d3dc7>] sched_debug_show+0x17/0x22
[ 56.334894] [<ffffffff811f0c4e>] seq_read+0x26a/0x350
[ 56.336390] [<ffffffff81225e6f>] proc_reg_read+0x48/0x67
[ 56.337915] [<ffffffff81225e27>] ? proc_reg_write+0x67/0x67
[ 56.339593] [<ffffffff811cf299>] __vfs_read+0x26/0xb9
[ 56.341091] [<ffffffff810d5e5b>] ? up_read+0x1f/0x35
[ 56.342564] [<ffffffff8108492d>] ? __do_page_fault+0x3aa/0x424
[ 56.344180] [<ffffffff811cf969>] vfs_read+0xa0/0x12e
[ 56.345489] [<ffffffff811d04cc>] SyS_read+0x51/0x92
[ 56.346433] [<ffffffff81c295f2>] entry_SYSCALL_64_fastpath+0x12/0x76
[ 56.347526] ---[ end trace 44f5e154b5cac1f9 ]---
[ 56.347526] ---[ end trace 44f5e154b5cac1f9 ]---
To reproduce:
git clone git://git.kernel.org/pub/scm/linux/kernel/git/wfg/lkp-tests.git
cd lkp-tests
bin/lkp install job.yaml # job file is attached in this email
bin/lkp run job.yaml
Thanks,
Kernel Test Robot
View attachment "config-4.4.0-rc1-00024-g1552eca" of type "text/plain" (107449 bytes)
Download attachment "dmesg.xz" of type "application/x-xz" (16156 bytes)
View attachment "job.yaml" of type "text/plain" (3184 bytes)
Download attachment "reproduce.sh" of type "application/x-sh" (40 bytes)
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